The submental electromyogram electrodes are placed in which of the following positions?

1. One on the center of the chin
2. Two along the jawline, 3 cm apart
3. Two on the hyoid bone lateral to each other and 2 cm apart
4. One on either side of the chin, between the chin and hyoid bone, 2 cm apart
a. 1 and 2 c. 2 and 3
b. 1 and 4 d. 3 and 4

ANS: B
Three electrodes are typically affixed to the chin with tape. Two of these electrodes are placed between the tip of the chin and the hyoid bone, lateral to each other and 2 cm apart; a third elec-trode is placed in the center of the chin.